/*
 * The contents of this web application are subject to the Mozilla Public License Version 
 * 1.1 (the "License"); you may not use this web application except in compliance with 
 * the License. You may obtain a copy of the License at http://www.mozilla.org/MPL/.
 * 
 * Software distributed under the License is distributed on an "AS IS" basis, 
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License 
 * for the specific language governing rights and limitations under the License.
 * 
 * The Original Code is owned by and the Initial Developer of the Original Code is 
 * Composite A/S (Danish business reg.no. 21744409). All Rights Reserved
 * 
 * Section 11 of the License is EXPRESSLY amended to include a provision stating 
 * that any dispute, including but not limited to disputes related to the enforcement 
 * of the License, to which Composite A/S as owner of the Original Code, as Initial 
 * Developer or in any other role, becomes a part to shall be governed by Danish law 
 * and be initiated before the Copenhagen City Court ("K�benhavns Byret")            
 */

using System;
using Composite.Core.Collections.Generic;


namespace Composite.Core.Implementation
{
    /// <summary>
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <exclude />
    [System.ComponentModel.EditorBrowsable(System.ComponentModel.EditorBrowsableState.Never)] 
    public class ImplementationContainer<T>
        where T : class
    {
        private T _implementation = null;
        private bool _disposed = false;
        private readonly Func<T> _create;



        internal ImplementationContainer(Func<T> create)
        {
            _create = create;
        }

        


        internal T Implementation
        {
            get
            {
                if (_implementation == null)
                {
                    CreateImplementation();
                }

                return _implementation;
            }
        }



        internal void CreateImplementation()
        {
            if (_disposed) throw new InvalidOperationException("Already disposed");

            _implementation = _create();
        }



        internal void DisposeImplementation()
        {
            _disposed = true;

            IDisposable disposable = _implementation as IDisposable;

            if (disposable != null)
            {
                disposable.Dispose();
            }

            _implementation = null;
        }
    }
}
